RE: Optimizing for Java and Tomcat (x-posted)

I suggest you just go through the exercise of creating a new subsystem description (CRTSBSD), reading the help as you go. That's how I did it. Once created, start it and see how it goes (STRSBS). Read the messages. Be sure to add a job queue entry to the subsystem description. Submit your java job to that jobq. I still like SBMJOB CMD(QSH CMD('java /tomcatpath/catalina.sh')) JOBQ(RJSTOMCAT/RJSTOMCAT). I create a library (RJSTOMCAT in the example) for the purpose of containing the subsystem description and the job queue and any other objects I need.

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-
bounces@xxxxxxxxxxxx] On Behalf Of James H. H. Lampert
Sent: Thursday, November 21, 2013 5:10 PM
To: Java Programming on and around the IBM i
Subject: Re: Optimizing for Java and Tomcat (x-posted)

On 11/20/13 3:10 PM, Dan Kimmel wrote:

"Optimize" is a loaded term. I don't know of any methods to optimize,
though I know a few tricks to make java (and Tomcat) run faster.

First, run java in its own storage pool. There's a couple ways to do
this. I create a separate subsystem and allocate a pool to it. I
allocate either a private pool or one of the *SHRPOOLxx's. . . .

Would anybody happen to have a recommendation on a tutorial for this?

The J9 jvm's beat hell of the classic except in rare circumstances.
On older versions of the OS, that's usually what's known as the "32
bit" jvm. On newer systems, there's 64-bit versions of some J9's
depending on Java version.

At the moment, we have Tomcat running in the JVM at
/QOpenSys/QIBM/ProdData/JavaVM/jdk60/64bit
on a V6R1 box. The CL we use to start Tomcat has that as its first
choice, and failing to find it looks for (in this order):
/qopensys/QIBM/ProdData/JavaVM/jdk60/32bit
/qopensys/QIBM/ProdData/JavaVM/jdk626/64bit
/qopensys/QIBM/ProdData/JavaVM/jdk626/32bit
/qopensys/QIBM/ProdData/JavaVM/jdk70/64bit
/qopensys/QIBM/ProdData/JavaVM/jdk70/32bit
and takes the first one it finds. Should I change this to prefer 32-bit
JVMs over 64-bit?

--
JHHL

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